The second title in Rick Riordan's Trials of Apollo series - set in the action-packed world of Percy Jackson.The god Apollo, cast down to earth and trapped in the form of a gawky teenage boy as punishment, must set off on the second of his harrowing (and hilarious) trials.He and his companions seek the ancient oracles - restoring them is the only way for Apollo to reclaim his place on Mount Olympus - but this is easier said than done.Somewhere in the American Midwest is a haunted cave that ma...